{"product_id":"seachoice-50-21004-full-flow-oil-filter-20-micron","title":"Seachoice 50-21004 Full-Flow Oil Filter – 20 Micron | Mercury \u0026 Mariner Outboard","description":"\u003csection class=\"product-description\"\u003e\n\n\u003ch2\u003eSeachoice 50-21004 Full-Flow Oil Filter – 20 Micron\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 50-21004  |  \u003cstrong\u003eSKU:\u003c\/strong\u003e 50-21004  |  \u003cstrong\u003eUPC:\u003c\/strong\u003e 719249210049\u003c\/p\u003e\n\n\u003cp\u003eThe Seachoice 50-21004 is a 20-micron full-flow spin-on oil filter for selected Mercury and Mariner 4-stroke outboard engines. It crosses directly to Sierra 18-7914 and to multiple Mercury and Quicksilver OEM filter numbers. Built with high-efficiency cellulose filter media, an epoxy-coated corrosion-resistant canister, reinforced body construction, heavy-duty end-cap seals, and an anti-drain-back valve, it meets or exceeds original equipment filtration requirements for applicable Mercury outboard applications.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFiltration: 20 micron\u003c\/li\u003e\n\u003cli\u003eFilter type: Full-flow spin-on\u003c\/li\u003e\n\u003cli\u003eThread: 20 mm x 1.5\u003c\/li\u003e\n\u003cli\u003eFilter media: High-efficiency cellulose\u003c\/li\u003e\n\u003cli\u003eAnti-drain-back valve: Yes\u003c\/li\u003e\n\u003cli\u003eCanister: Epoxy-coated reinforced steel\u003c\/li\u003e\n\u003cli\u003eEnd-cap seals: Heavy-duty\u003c\/li\u003e\n\u003cli\u003eManufactured in an ISO\/TS 16949 certified facility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMercury 25 HP 4-stroke carbureted outboards, 2006 and earlier\u003c\/li\u003e\n\u003cli\u003eMercury 30 HP 3-cylinder 4-stroke outboards, 2005 and earlier\u003c\/li\u003e\n\u003cli\u003eMercury 40–60 HP 4-stroke outboards, 1998 and newer (selected configurations)\u003c\/li\u003e\n\u003cli\u003eMercury 75–115 HP 4-stroke outboards (selected serial number ranges — verify before ordering)\u003c\/li\u003e\n\u003cli\u003eMariner 4-stroke outboards specifying the listed Mercury OEM filter numbers\u003c\/li\u003e\n\u003cli\u003eOther Mercury and Mariner 4-stroke applications cross-referencing Sierra 18-7914\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eFitment Note:\u003c\/strong\u003e Mercury uses several similar-looking filters across its 4-stroke outboard lineup. Always confirm fitment by matching the existing filter’s OEM part number or the Sierra 18-7914 cross-reference. Confirm by engine model, model year, and serial number — do not order by appearance alone.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eService Interval\u003c\/h2\u003e\n\u003cp\u003eReplace at every scheduled engine oil service. Follow Mercury’s recommended interval for your specific outboard model — typically every 100 hours or once per season, whichever comes first.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRemove the old filter and confirm the old gasket has come away with it — a retained gasket will cause an oil leak\u003c\/li\u003e\n\u003cli\u003eClean the filter mounting surface\u003c\/li\u003e\n\u003cli\u003eLightly coat the new filter gasket with fresh engine oil before threading it on\u003c\/li\u003e\n\u003cli\u003eTighten by hand plus ¾ turn, or per Mercury service specification — do not over-tighten\u003c\/li\u003e\n\u003cli\u003eRun the engine and inspect for leaks before returning to service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCross-Reference Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeachoice:\u003c\/strong\u003e 50-21004 \/ 21004\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSierra:\u003c\/strong\u003e 18-7914\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury:\u003c\/strong\u003e 35-822626K04, 35-822626T2, 35-877768K01, 35-8M0008397, 35-8M0064104\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury \/ Quicksilver:\u003c\/strong\u003e 35-822626Q04, 35-822626Q2\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/sierra-7914-4-cycle-outboard-oil-filter\"\u003eSierra 7914 4-Cycle Outboard Oil Filter\u003c\/a\u003e — Sierra OEM-equivalent filter this unit replaces\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-18-7913-4-cycle-outboard-oil-filter-mercury-honda-47-7913\"\u003eSierra 18-7913 4-Cycle Outboard Oil Filter – Mercury \u0026amp; Honda\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachoice-50-21011-full-flow-oil-filter-20-micron\"\u003eSeachoice 50-21011 Full-Flow Oil Filter – 20 Micron\u003c\/a\u003e — Mercury FourStroke \u0026amp; Yamaha 69J-series filter\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachoice-50-21001-full-flow-oil-filter-20-micron\"\u003eSeachoice 50-21001 Full-Flow Oil Filter – 20 Micron\u003c\/a\u003e — MerCruiser, Volvo Penta \u0026amp; OMC sterndrive filter\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachoice-50-21018-full-flow-oil-filter-20-micron\"\u003eSeachoice 50-21018 Full-Flow Oil Filter – 20 Micron\u003c\/a\u003e — Yamaha 4-stroke outboard filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest Use Case:\u003c\/strong\u003e Routine oil and filter changes on Mercury and Mariner 4-stroke outboards in the 25–115 HP range that call for the Sierra 18-7914 or Mercury 35-822626 \/ 35-8M0064104 filter family. This is a high-volume service filter for a broad range of popular mid-size Mercury 4-stroke outboards, making it a practical stock item for dealers and boaters on a regular maintenance schedule.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Issues:\u003c\/strong\u003e Mercury uses multiple similar-looking spin-on filters with different thread specs and internal configurations across model years and HP ranges — the most common ordering error is choosing the wrong filter by appearance. The safest confirmation method is to match one of the OEM Mercury part numbers listed above, or the Sierra 18-7914 cross-reference, against what is currently on the engine. Always confirm by model year and serial number for engines at the edge of the horsepower ranges listed.\u003c\/p\u003e\n\n\u003c\/section\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199649513508,"sku":"50-21004","price":13.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/50-21017_Main_4579404f-855d-4186-b31f-1dc15187d9ff.jpg?v=1785611149","url":"https:\/\/marisolmarine.com\/products\/seachoice-50-21004-full-flow-oil-filter-20-micron","provider":"Marisol Marine Company","version":"1.0","type":"link"}